AQS 51/61 CO2 / TEMPERATURE SENSOR WITH BUILT-IN CONTROLLER
EN1B-0189GE51 R0102
4
Table 2. Electrical terminal connections for AQS51/61
Connection
terminal
Function
Electrical data
Remarks
G+
power (+)
24 Vac/dc+ (
±
20%), 3 W
2 W without output load
1
G0
power ground (-)
24 Vac/dc-
OUT1
analog output 1 (+) 0...10 Vdc or 0...20 mA
2...10 Vdc or 4...20 mA
According to positions of OUT1 and start
point of jumpers
2
OUT2
analog output 2 (+) same as output 1
According to positions of OUT2 and start
point of jumpers
2
M
signal ground (-)
connected to G0 via PTC fuse
See note 1!
Relay
normally open
contact-free relay; min. load: 1 mA / 5 V;
rated load: 0.5 A / 125 Vac, 1 A / 24 Vdc
Triggered by register OUT3
OUT4
analog output 4 (+)
or open collector
0...10 Vdc; max. 0.5 A, 60 Vdc / 40 Vac
(half-wave rectifier protection)
According to positions of OUT4. See also
notes 2 and 3!
DI1
digital input 1
closed contact current: 1 mA, open
voltage contact: max. 5 V
Do not apply any voltage to this input!
NOTE 1:
The ground terminal is used as negative power supply DC input or AC phase ground G0 (half-wave rectifier). The
signal ground M, protected by a PTC resistor, is the same as power ground G0 (permitting a ”3-wire” configuration). A
single transformer may be used for the entire system.
NOTE 2:
AQS51/61 can deliver both a voltage or a current loop for OUT1/OUT2. For OUT4 a voltage output or an open
collector output is selected with jumper OUT4. To change between voltage and current output mode the hardware
jumpers are used. There is one jumper for OUT1 and one for OUT2, so that one output can be a voltage output and
the other a current output. Both voltage output and current output can have start points 0 % (0-10 VDC or 0-20mA) or
20% (2-10 VDC or 4-20mA). The same start point is used for both outputs. See Table 1.
NOTE 3:
The open collector's current is internally returned to the G0 terminal.
Output Configurations
The sensors/controllers are supplied from the factory (unless
otherwise ordered) with 0...10 Vdc linear outputs for OUT1
and OUT2 and for OUT4 when it is used as an open collector
output (see Table 1). If different outputs are needed for the
application, these have to be configured before the unit is
powered up. To select alternative output ranges, position the
four jumpers as required for the application. Each jumper
selection is independent from the others, except in the case
of the “Start point selection” jumper, which affects both linear
outputs (i.e. OUT1 and OUT2).
Table 3. Configuration jumpers for AQS51/61
Jumper
Position
Function
0%
Jumper top position provides a 0 Vdc or 0 mA start point for OUT1 and OUT2 (0...20 mA or 0...10 V).
OUT4 has a 0 V output start point when jumper OUT4 is in the “voltage” position (0...10 V).
start point
of the
selection
jumper
20%
Jumper bottom position provides a 2 Vdc or 4 mA start point for OUT1 and OUT2 (4...20 mA or
2...10 V). OUT4 has a 0 V output start point when jumper OUT4 is in the “voltage” position (0...10 V).
current
Connection in the "current" position provides a 0/4...20 mA output range for OUT1.
OUT1
voltage
Connection in the "voltage" position provides a 0/2...10 Vdc output range for OUT1.
current
Connection in the "current" position provides a 0/4...20 mA output range for OUT2.
OUT2
voltage
Connection in the "voltage" position provides a 0/2...10 Vdc output range for OUT2.
current
Connection in the "open collector" position provides an open collector output. Max. 0.5 A, 60 Vdc /
40 Vac (half-wave rectifier).
OUT4
voltage
Connection in the "voltage" position provides a 0...10 Vdc output range for OUT4.
Push Button Operation for AQS61
This sensor has two push buttons, MENU and ESC, located
on the front panel behind the flip-down lid. The YELLOW
LED will acknowledge a successful push by a short flash.
The push button MENU is available for selection of display
value or maintenance commands, whereas ESC is available
to escape back from a selected level.
Display Modes
In the DISPLAY MODE, the push button MENU is used to
select the value to be indicated on the display: CO
2
con-
centration and temperature (alternating), error code, CO
2
,
temperature, output 1, output 2, or output 4. After the device
is powered up, the display will always return to the default
display mode
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